Electronic device, wireless communication method and computer readable medium

ABSTRACT

The present disclosure relates to an electronic device, a wireless communication method, and a computer readable medium. The electronic device includes a processing circuitry. The processing circuitry is configured to generate a discovery reference signal for an unlicensed band. The discovery reference signal contains a primary synchronization signal, a secondary synchronization signal and a channel state information reference signal.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. application Ser. No.17/726,629, filed Apr. 22, 2022, which is a continuation of U.S.application Ser. No. 16/325,186, filed Feb. 13, 2019 (now U.S. Pat. No.11,343,038), which is based on PCT filing PCT/CN2017/100997, filed Sep.8, 2017, and claims priority to 201710765929.7, filed in the ChinesePatent Office on Aug. 30, 2017, the entire contents of each of whichbeing incorporated herein by reference.

FIELD

The present disclosure relates generally to the field of wirelesscommunication, and more particularly to an electronic device forwireless communication, a wireless communication method and a computerreadable medium.

BACKGROUND

Discovery reference signal (DRS) has been added in 3GPP (3rd GenerationPartnership Project) Rel-12 with respect to supporting basic functionsof a small cell switch. In licensed assisted access (LAA) in 3GPPRel-13, the main functions of DRS are still used, and the content andquantity of signals included in DRS are increased.

SUMMARY

A brief summary of embodiments of the present disclosure is set forthbelow in order to provide a basic understanding of certain aspects ofthe present disclosure. It should be understood that the followingsummary is not an exhaustive overview of the present disclosure. It isnot intended to identify key or critical aspects of the presentdisclosure, nor it is intended to define the scope of the presentdisclosure. Its purpose is simply to present some concepts in asimplified form as a prelude to a more detailed description discussedlater.

According to an embodiment, an electronic device for wirelesscommunication is provided which includes a processing circuitry. Theprocessing circuitry is configured to generate a DRS for an unlicensedband. The DRS contains a primary synchronization signal (PSS), asecondary synchronization signal (SSS) and a channel state informationreference signal (CSI-RS).

According to another embodiment, an electronic device for wirelesscommunication is provided which includes a processing circuitry. Theprocessing circuitry is configured to generate a DRS for an unlicensedband, and control to transmit the DRS with a shorter subcarrier spacingthan a subcarrier spacing corresponding to 15 kHz.

According to yet another embodiment, an electronic device for wirelesscommunication is provided which includes a processing circuitry. Theprocessing circuitry is configured to generate a DRS for an unlicensedband, and when DRSs to be transmitted cannot be completely transmittedwithin a currently configured discovery measurement timing configuration(DMTC) window period, control to transmit the DRS using an extended DMTCwindow.

According to still another embodiment, an electronic device for wirelesscommunication is provided which includes a processing circuitry. Theprocessing circuitry is configured to generate a DRS for an unlicensedband, and control to transmit the DRS by a target channel in theunlicensed band without performing an energy detection for the targetchannel.

According to yet another embodiment, an electronic device for wirelesscommunication is provided which includes a processing circuitry. Theprocessing circuitry is configured to generate a DRS for an unlicensedband, and control to transmit the DRS based on a combination of anomnidirectional channel energy detection and a directional channelenergy detection. A manner of the combination of an omnidirectionalchannel energy detection and a directional channel energy detectionincludes: performing the omnidirectional channel energy detection, anddirectionally transmitting the DRS if it is detected that a targetchannel is idle; if the omnidirectional channel energy detectionindicates that the target channel is non-idle, performing directionalchannel energy detection, directionally transmitting the DRS for adirection detected as being idle, and not transmitting the DRS for adirection detected as being non-idle.

According to another embodiment, an electronic device for wirelesscommunication is provided which includes a processing circuitry. Theprocessing circuitry is configured to generate a discovery referencesignal DRS for an unlicensed band. The DRS contains a primarysynchronization signal PSS, a secondary synchronization signal SSS and aphysical broadcast channel demodulation reference signal PBCH-DMRS.Optionally, the DRS may further contain a channel state informationreference signal CSI-RS.

According to still another embodiment, a wireless communication methodis provided which includes: generating a DRS for an unlicensed band,where the DRS contains a PSS, an SSS, and a CSI-RS.

According to yet another embodiment, a wireless communication method isprovided which includes: generating a DRS for an unlicensed band; andtransmitting the DRS with a subcarrier spacing higher than 15 kHz.

According to still another embodiment, a wireless communication methodis provided which includes: generating a DRS for an unlicensed band; andwhen DRSs to be transmitted cannot be completely transmitted within acurrently configured DMTC window period, transmitting the DRS using anextended DMTC window.

According to yet another embodiment, a wireless communication method isprovided which includes: generating a DRS for an unlicensed band; andtransmitting the DRS by a target channel in the unlicensed band withoutperforming an energy detection for the target channel.

According to still another embodiment, a wireless communication methodis provided which includes: generating a DRS for an unlicensed band, andtransmitting the DRS based on a combination of an omnidirectionalchannel energy detection and a directional channel energy detection. Amanner of the combination of the omnidirectional channel energydetection and the directional channel energy detection includes:performing the omnidirectional channel energy detection, anddirectionally transmitting the DRS if it is detected that a targetchannel is idle; if the omnidirectional channel energy detectionindicates that the target channel is non-idle, performing thedirectional channel energy detection, directionally transmitting the DRSfor a direction detected as being idle, and not transmitting the DRS fora direction detected as being non-idle.

According to another embodiment, a wireless communication method isprovided which includes: generating a discovery reference signal DRS foran unlicensed band. The DRS contains a primary synchronization signalPSS, a secondary synchronization signal SSS and a physical broadcastchannel demodulation reference signal PBCH-DMRS. Optionally, the DRS mayfurther contain a channel state information reference signal CSI-RS.

According to yet another embodiment, a computer readable medium isprovided which includes executable instructions that, when executed byan information processing device, cause the information processingdevice to implement the methods described above.

Embodiments of the present disclosure provide a solution for DRS on anew radio (NR) unlicensed band, for example.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure may be better understood by referring to thefollowing description given in conjunction with the drawings, in whichthe same or similar reference numerals are used throughout the drawingsto indicate the same or similar parts. The drawings together withfollowing detailed description are included in the present specificationand form a part of the specification, and are used to further illustratepreferred embodiments of the present disclosure and explain theprinciple and advantage of the present disclosure. In the drawings:

FIG. 1 is a block diagram showing a configuration example of anelectronic device for wireless communication according to an embodimentof the present disclosure;

FIG. 2 is a block diagram showing a configuration example of anelectronic device for wireless communication according to anotherembodiment of the present disclosure;

FIG. 3 is a flowchart showing a procedure example of a wirelesscommunication method according to an embodiment of the presentdisclosure;

FIG. 4 is a flowchart showing a procedure example of a wirelesscommunication method according to another embodiment of the presentdisclosure;

FIG. 5 is a flowchart showing a procedure example of a wirelesscommunication method according to yet another embodiment of the presentdisclosure;

FIG. 6 is a flowchart showing a procedure example of a wirelesscommunication method according to still another embodiment of thepresent disclosure;

FIG. 7 is a flowchart showing a procedure example of a wirelesscommunication method according to another embodiment of the presentdisclosure;

FIG. 8 is a block diagram showing a configuration example of a wirelesscommunication device according to an embodiment of the presentdisclosure;

FIG. 9 is a block diagram showing a configuration example of a wirelesscommunication device according to another embodiment of the presentdisclosure;

FIG. 10 is a block diagram showing an exemplary structure of a computerthat implements method and device according to the present disclosure;

FIG. 11 is a block diagram showing an example of a schematicconfiguration of a smartphone to which the technology of the presentdisclosure may be applied;

FIG. 12 is a block diagram showing an example of a schematicconfiguration of a gNB to which the technology of the present disclosuremay be applied;

FIG. 13 is a schematic diagram for illustrating an example structure ofa DRS according to an embodiment of the present disclosure;

FIG. 14 is a schematic diagram for illustrating an expanded discoverymeasurement timing configuration window according to an embodiment ofthe present disclosure;

FIG. 15 is a schematic diagram for illustrating a DRS transmissionwithout performing an energy detection for a target channel according toanother embodiment of the present disclosure;

FIG. 16 is a schematic diagram for illustrating a DRS transmission fordifferent beam directions according to yet another embodiment of thepresent disclosure;

FIG. 17 is a flowchart for illustrating an procedure example of a DRStransmission for different beam directions according to an embodiment ofthe present disclosure;

FIGS. 18 and 19 are schematic diagrams for illustrating examples oftime-frequency resources of respective signals in a DRS according to anembodiment of the present disclosure;

FIG. 20 is a schematic diagram for illustrating an example structure ofa DRS according to another embodiment of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

Embodiments of the present disclosure will be described below withreference to the drawings. The elements and features described in afigure or an embodiment of the present disclosure may be combined withelements and features illustrated in one or more other FIGS. orembodiments. It should be noted that, for the sake of clarity,representations and descriptions of components and processes known tothose skilled in the art that are not relevant to the present disclosureare omitted from the drawings and the description.

As shown in FIG. 1 , an electronic device 100 for wireless communicationaccording to the present embodiment includes a processing circuitry 110.The processing circuitry 110 may be implemented, for example, as aspecific chip, a chipset, or a central processing unit (CPU) or thelike.

The processing circuitry 110 includes a generating unit 111. It shouldbe noted that, although the generating unit 111 and the like are shownin the form of functional blocks in the drawings, it should beunderstood that functions of the respective units may be implemented asa whole by the processing circuitry, and it is not necessary to beimplemented by discrete actual components in the processing circuitry.In addition, although the processing circuitry is shown by a block inthe drawings, the electronic device may include a plurality ofprocessing circuitry, and functions of the respective units may bedistributed to the plurality of processing circuitry, therebycooperatively operating by the plurality of processing circuitry toperform these functions.

The generating unit 111 is configured to generate a DRS for anunlicensed band, the DRS contains a PSS, an SSS, and a CSI-RS.

The DRS is used to enable the device (even in the case of deactivation)to keep in synchronization with a secondary carrier component.Embodiments of the present disclosure provide solutions for DRS on NRunlicensed bands, for example.

Next, a DRS according to an embodiment of the present disclosure and itsadvantages are illustrated.

In the original DRS design, only one set of synchronization signals (DRSoccasions) is included in each subframe, and locations of the DRSpatterns are across time slots. However, such a design is wasteful inthe NR scenario, because one subframe including one DRS signal meansthat each DRS transmission is delayed by 1 millisecond compared to theprevious DRS transmission, which may make a downlink synchronizationperiod significantly increases, and affecting system efficiency. Inaddition, the CRS in the original DRS occupies more resources, which mayconsequently increases resource overhead of a reference signal.Therefore, the present disclosure uses a CSI-RS to implement functionsof the original CRS. The CSI-RS may be a cell-level reference signal. Inaddition, the CSI-RS may have a beam management function to assist theuser equipment (UE) and the gNB to perform operations such as a beampairing.

FIG. 13 illustrates an example of a DRS configuration according to anembodiment of the present disclosure. As shown in FIG. 13 , a new DRSblock (DRS block, which is a minimum unit of downlink synchronization ona NR unlicensed band) is composed of a PSS, an SSS and a CSI-RS, wherethe PSS and SSS are used for downlink synchronization, and the CSI-RS isused for measurement of a reference signal received power (RSRP) and areference signal received quality (RSRQ) and a channel downlink channelquality and the like.

It is to be noted that, although several examples (Alt.1 to Alt.3) ofarrangement order of symbols in a DRS block are given in FIG. 13 , theDRS structure according to an embodiment of the present disclosure isnot limited to the illustrated examples.

In the illustrated examples, the number of symbols constituting a DRSblock is 4, although in other embodiments, the number of symbolsconstituting a DRS block may be more than 4. For example, in the casewhere Wi-Fi or other unlicensed band occupation technology is denselydeployed, in order to ensure a reliable transmission of a downlinksynchronization signal of a NR for a successive occupancy of a channel,a DRS transmission with more than 4 orthogonal frequency divisionmultiplexing (OFDM) symbols may be adopted to ensure a successiveoccupancy of a wireless channel.

Accordingly, according to an embodiment, one DRS block has a length ofat least four OFDM symbols.

As shown in the above examples, according to an embodiment, the PSS, SSSand CSI-RS constituting one DRS block may occupy successive OFDMsymbols. Preferably, the PSS, SSS and CSI-RS in the same DRS block maybe arranged in the same time slot to thereby further facilitatingdetection by a user.

However, embodiments of the present disclosure are not limited thereto.For example, the PSS, SSS and CSI-RS in the DRS block may also beinconsecutive (i.e., occupying inconsecutive OFDM symbols in timedomain), and may not be arranged in one time slot.

Further, the PSS, SSS and CSI-RS in the DRS block may have variousarrangement orders. For example, the signal arrangement orders in theDRS block may include:

-   -   PSS, SSS, CSI-RS, CSI-RS;    -   PSS, CSI-RS, SSS, CSI-RS;    -   CSI-RS, PSS, SSS, CSI-RS;    -   PSS, CSI-RS, CSI-RS, SSS;    -   CSI-RS, PSS, CSI-RS, SSS;    -   CSI-RS, CSI-RS, PSS, SSS;    -   SSS, PSS, CSI-RS, CSI-RS;    -   SSS, CSI-RS, PSS, CSI-RS;    -   CSI-RS, SSS, PSS, CSI-RS;    -   SSS, CSI-RS, CSI-RS, PSS;    -   CSI-RS, SSS, CSI-RS, PSS; or    -   CSI-RS, CSI-RS, SSS, PSS.

According to an embodiment, in one DRS block, the PSS and SSS (the orderof the PSS and SSS is not limited) may be arranged before the CSI-RS. Byarranging a synchronization signal before the CSI-RS, a user can, forexample, directly perform synchronization sequence correlation withoutbuffering synchronization data (DRS), thereby completing the downlinksynchronization quickly.

In addition, according to an embodiment, two successively arrangedCSI-RSs may be included in one DRS block. The successive arrangement ofCSI-RSs facilitates reducing complexity of UE detection, for example.

The above illustrates an example arrangement manner of signals in a DRSblock in time domain. In addition, according to an embodiment, theCSI-RS may be full-bandwidth in frequency domain, while the PSS and SSSmay occupy only a predetermined number of central subcarriers.

The CSI-RS being full-bandwidth means that the CSI-RS may be configuredon any subcarrier over the entire bandwidth, the any subcarrier may bedetermined according to specific applications and needs. The number ofCSI-RSs may be determined according to antenna ports, and each resourceblock (RB) may be provided with a CSI-RS.

FIGS. 18 and 19 illustrate examples of time-frequency resources ofrespective signals in a DRS, however, the illustrated examples aremerely illustrative and not limiting.

In the above exemplary embodiment, one subframe may include 1 or 2 DRSblocks. Furthermore, DRS blocks within one subframe may be defined toconstitute one DRS burst. However, the number of DRS blocks included ina DRS burst is not limited thereto.

According to an embodiment, the generating unit 111 may be configured togenerate a DRS burst composed of a predetermined number of DRS blocks,where the predetermined number may be determined according to anoperation frequency point.

More specifically, for example, for an operation frequency point infrequency band less than 3 GHz, each DRS burst may contain up to 4 DRSblocks; for an operation frequency point in a frequency band greaterthan 3 GHz and less than 6 GHz, each DRS burst may contain up to 8 DRSblocks; for an operation frequency band in a frequency band greater than6 GHz and less than 52.6 GHz, each DRS burst may contain up to 64 DRSblocks.

Further, according to an embodiment, the generated DRS may betransmitted with different subcarrier spacings. As shown in FIG. 2 , anelectronic device 200 for wireless communication according to thepresent embodiment includes a processing circuitry 210. The processingcircuitry 210 includes a generating unit 211 and a control unit 213. Theconfiguration of the generating unit 211 is similar to the generatingunit 111 illustrated above with reference to FIG. 1 , and a repeateddescription thereof is omitted here.

The control unit 213 is configured to control to transmit the DRSgenerated by the generating unit 211 with a subcarrier spacing shorterthan a subcarrier spacing corresponding to 15 kHz.

As an example, the control unit 213 may be configured to control totransmit the DRS with a subcarrier spacing corresponding to 120 kHz, 240kHz, or 480 kHz.

The DMTC length in LTE-LAA is fixed to 6 ms, and the DMTC length is oneof the basic configuration information of a LAA secondary cell notifiedto a user by a primary cell radio resource control (RRC) signaling of abase station. In the NR-LAA, for example, due to a scenario settingcombining multiple beams, the minimum DMTC window that can support up to64 DRS block transmissions on a high frequency point band also needs 32ms, that is, each subframe contains 2 DRS blocks. Based on aboveconsiderations, the window size of DMTC needs to be extended to be atleast not less than 32 ms. The minimum value N of DMTC is closelyrelated to the number n of DRS blocks included in one subframe, that is,N>64/n (in a high frequency point band scenario) is met. The above is acalculation result of the DMTC window length based on a subcarrierspacing (SCS) of 15 kHz in the system. It can be seen that for a highfrequency point scenario, its corresponding DMTC window is extended toas much as 5 times the original, which greatly increases the occupationtime of an unlicensed band channel, and there is a possibility that theprinciple of fair occupancy of a wireless channel is violated.Therefore, in order to ensure the fairness of channel occupation of aDRS transmission, an SCS greater than 15 kHz may be used to ensure thata DMTC window period does not exceed 10 ms, for example.

Therefore, in this embodiment, an SCS such as 120 kHz (the DMTC windowis 8 ms), 240 kHz (the DMTC window is 4 ms) and 480 kHz (the DMTC windowis 2 ms) can be supported.

By means of the above embodiments, it helps to avoid occupying anexcessive time by an unlicensed band channel, thereby ensuring a fairoccupation of the wireless channel.

Next, an electronic device for wireless communication according toanother embodiment of the present disclosure will be illustrated. Sinceit is similar to the structure of the embodiment illustrated above withreference to FIG. 2 , the electronic device of the present embodimentwill also be illustrated with reference to FIG. 2 . However, it shouldbe noted that the electronic device according to the present embodimentcan be implemented independently of the above embodiments.

The electronic device 200 for wireless communication according to thepresent embodiment includes a processing circuitry 210. The processingcircuitry 210 includes a generating unit 211 and a control unit 213. Theconfiguration of the generating unit 211 is similar to the generatingunit 111 illustrated above with reference to FIG. 1 .

The control unit 213 is configured to, when DRSs to be transmittedcannot be completely transmitted within a currently configured DMTCwindow period, control to transmit the DRS using an extended DMTCwindow.

In the existing LAA, a limitation with regard to DMTC is that the windowsize is fixed and unadjustable. This is acceptable for an original DRSsignal with a length of 12 OFDM symbols. According to the existingmanner, if a DRS transmission time length is not reached but the basestation successfully detects that the channel is idle and accesses thechannel, the current window period is automatically missed, and the DRSsignal is not transmitted. However, for the case where one subframecontains multiple DRS signals (for example, each DRS may represent adifferent beam direction), a certain too late window access which causesa DRS transmission to be discarded may bring a greater performancedegradation to the entire system.

Based on above considerations, the purpose of the present embodiment isto ensure that each DMTC window has a complete DRS signal transmissionas much as possible, rather than discarding half or more of the DRSsignals. To this end, an extendable DMTC window for a DRS transmissionis proposed. The extendable DMTC window may be applied to both a DRStransmission on the base station side and a DRS reception on the userside.

As shown in FIG. 14 , an extended DMTC may be initiated by the basestation side. Specifically, when the base station finds that DRSs whichneed to be transmitted cannot be completely transmitted within acurrently configured DMTC window period, the DMTC window may beautomatically extended to complete a DRS transmission.

On the user side, when DRSs are not completely received within aspecified DMTC window period, the DMTC window may be automaticallyextended to ensure a complete reception of DRSs as much as possible. Ifa reception of all DRSs still cannot be finished within the extendedDMTC window (for example, the extended upper limit may be set to aspecified DMTC window length) period, the user may keep this DRSreception data and try to merge with the next received DRS and counttogether to complete the downlink synchronization and the channelquality measurement. The advantage of using this manner is that there isno overhead of additional control signaling, the base station and theuser equipment (UE) may autonomously transmit and receive DRS signalsunder an established rule.

However, the embodiments are not limited to an autonomously extendedDMTC window. For example, the user equipment may extend a DMTC windowbased on information from the base station. Accordingly, according to anembodiment, the control unit 213 may be configured to control to notifythe user equipment of the size of the extended DMTC window by a licensedfrequency band.

Next, an electronic device for wireless communication according toanother embodiment of the present disclosure will be illustrated. Sinceit is similar to the structure of the embodiment illustrated above withreference to FIG. 2 , the electronic device of the present embodimentwill also be illustrated with reference to FIG. 2 . However, it shouldbe noted that the electronic device according to the present embodimentcan be implemented independently of the above embodiments.

The electronic device 200 for wireless communication according to thepresent embodiment includes a processing circuitry 210. The processingcircuitry 210 includes a generating unit 211 and a control unit 213. Theconfiguration of the generating unit 211 is similar to the generatingunit 111 illustrated above with reference to FIG. 1 .

The control unit 213 is configured to control to transmit the DRSgenerated by the generating unit 211 by a target channel in theunlicensed band without performing an energy detection for the targetchannel.

In LTE-LAA, the DRS transmission is limited by a result of listen beforetalk (LBT). If the LBT detects that the current channel is busy, the DRStransmission opportunity (TxOP) in a certain DMTC window period may notbe normally transmitted, which may cause DRSs in one or several DMTCwindow periods to be unable to be transmitted. This may reduce thesynchronization efficiency of a NR-LAA system in the case where theunlicensed band environment is relatively crowded. Therefore, thepresent embodiment proposes a DRS transmission mode combining LBT and noLBT, so as to meet the requirement that NR-LAA needs more resources totransmit more reliable DRSs on an unlicensed band, for example.

According to the present embodiment, the base station does not need toperform LBT before the first DRS transmission. The DRS transmissionprocedure without LBT may be configured to meet the channel fairoccupancy scheme shown in FIG. 15 . Specifically, the NR system mayperiodically occupy an unlicensed band channel, and select a suitableduty cycle to transmit information such as a DRS and a PDSCH (physicaldownlink shared channel)/PDCCH (physical downlink control channel). Whenperforming a LRS transmission without LBT, for example, a threshold maybe set for the number of DRS transmission failures, or a fast feedbackrelating to a DRS reception status fed back by the user on a licensedfrequency band may be obtained. If the number of DRS transmissionfailures exceeds the set threshold, or the base station successivelyreceives NACK (Negative Acknowledge) messages about DRS reception fedback by the user on a licensed frequency band, a LBT-based DRStransmission procedure may be triggered, that is, the DRS transmissionduring a period of time afterwards needs to be based on a detectionresult of LBT. In addition, the DMTC window of DRS based on LBT-freeneed not to be extendable, as long as once polling of DRS transmissionswithin one DMTC window period (e.g., DRSs for each beam direction) isguaranteed.

Accordingly, according to an embodiment, the control unit 213 may befurther configured to control to receive feedback information relatingto a reception status of the DRS from a user equipment.

Further, the control unit 213 may be further configured to control,according to the feedback information, to switch between a DRStransmission mode without performing an energy detection and a DRStransmission mode with an energy detection.

Next, an electronic device for wireless communication according toanother embodiment of the present disclosure will be illustrated. Sinceit is similar to the structure of the embodiment illustrated above withreference to FIG. 2 , the electronic device of the present embodimentwill also be illustrated with reference to FIG. 2 . However, it shouldbe noted that the electronic device according to the present embodimentcan be implemented independently of the above embodiments.

The electronic device 200 for wireless communication according to thepresent embodiment includes a processing circuitry 210. The processingcircuitry 210 includes a generating unit 211 and a control unit 213. Theconfiguration of the generating unit 211 is similar to the generatingunit 111 illustrated above with reference to FIG. 1 . In particular, inthe present embodiment, the DRS block generated by the generating unit211 may contain information related to a transmit beam index.

The control unit 213 is configured to control to respectively transmitthe DRS blocks generated by the generating unit 211 for different beamdirections.

For example, the beam index information may be included in the PSSor/and SSS or may be included in the CSI-RS.

In the present embodiment, for example, for the characteristic that theNR system operates in a high frequency point band, the index informationof beams is included in each DRS block, and different beams havedifferent indexes, which means that several DRS blocks in the samesubframe may indicate information for different beams.

In addition, NR-LAA may still remain the original LBT-based DRStransmission. Considering the characteristic that the NR system adopts amulti-beam transmission, whether or not the DRS in each beam directionat each time can be transmitted cannot be definitely guaranteed due tobeing subject to LBT, the system delay and reliability will be lowerthan the system performance of the LTE-LAA system.

To this end, according to an embodiment of the present disclosure, anintegrated channel detection manner that combines an omnidirectionalClear Channel Assessment (CCA) and a directional CCA is provided todetermine an interference-free beam direction in which a DRSs can betransmitted.

According to an embodiment, the control unit 213 may be configured tocontrol to transmit the DRS based on an omnidirectional channel energydetection, transmit the DRS based on a directional channel energydetection, or transmit the DRS based on a combination of theomnidirectional channel energy detection and the directional channelenergy detection.

More specifically, a manner of the combination of the omnidirectionalchannel energy detection and the directional channel energy detectionmay include: performing the omnidirectional channel energy detection,and directionally transmitting the DRS if it is detected that a targetchannel is idle; if the omnidirectional channel energy detectionindicates that the target channel is non-idle, performing thedirectional channel energy detection, directionally transmitting the DRSfor a direction detected as being idle, and not transmitting the DRS fora direction detected as being non-idle.

This procedure will be illustrated in more detail with reference to FIG.16 . As shown by the dotted circle on the right side of FIG. 16 , aconventional CCA is based on an omnidirectional energy detection of theantenna. If the NR system operating in the high frequency point banduses the omnidirectional CCA detection, the base station may not be ableto detect the Wi-Fi access point interference indicated by the trianglein the figure due to a larger scale path fading in the environment, andthus missed detection may occur. For the NR-LAA users, the result ofmissed detection may be such that users in the direction in which theinterference is located cannot correctly implement the downlink DRSreception, and may also interfere with the transmission of Wi-Fi orother resource occupancy technology operating in this beam direction.

According to the present embodiment, by using a DRS transmission modebased on CCA detection of beams, the DRS can only be transmitted in thedirection in which the channel is detected to be idle, therebyfacilitating to ensure the fairness of channel occupation.

A procedure example using the manner of combination of anomnidirectional channel energy detection and a directional energydetection as a channel detection before a DRS transmission will beillustrated with reference to FIG. 17 . As the first DRS transmission,the base station first performs an omnidirectional CCA, and if thechannel is detected to be idle, then directionally transmit the DRS(this procedure may include DRS transmission failures in somedirections). On the other hand, if an energy detection value of theomnidirectional CCA is greater than the set threshold (i.e., the channelis busy), the CCA in specific directions, that is, the CCA based on beam1 to the CCA based on beam n in the figure, are performed. For eachbeam, the DRS of the corresponding beam is transmitted only when it isdetected to be idle. If the detection result of a channel is busy, theDRS transmission in the corresponding beam direction within this DMTCwindow is discarded.

Next, an electronic device for wireless communication according toanother embodiment of the present disclosure will be illustrated. Sinceit is similar to the structure of the embodiment illustrated above withreference to FIG. 2 , the electronic device of the present embodimentwill also be illustrated with reference to FIG. 2 . However, it shouldbe noted that the electronic device according to the present embodimentcan be implemented independently of the above embodiments.

The electronic device 200 for wireless communication according to thepresent embodiment includes a processing circuitry 210. The processingcircuitry 210 includes a generating unit 211 and a control unit 213. Theconfiguration of the generating unit 211 is similar to the generatingunit 111 illustrated above with reference to FIG. 1

The control unit 213 is configured to control to transmit the DRSgenerated by the generating unit 211 with a discovery measurement timingconfiguration DMTC period less than 40 ms.

However, it should be noted that embodiments of the present disclosureare not limited thereto. For example, a period of the DMTC may be 10ms-200 ms, for example, may be 10 ms, 20 ms, 40 ms, 80 ms, 160 ms, orthe like. In addition, a window size of the DMTC may be, for example, 6ms-40 ms, for example, 6 ms, 10 ms, or the like. In addition, variouscombinations of the DMTC period and the DMTC window size may be used aslong as the DMTC period is greater than the configured correspondingDMTC window size.

Next, an electronic device for wireless communication according tofurther some embodiments of the present disclosure will still beillustrated with reference to FIG. 2 , without repeating some of thedetails that have been described above. It should be noted that theelectronic device according to the following embodiments can beimplemented independently of the above embodiments.

According to an embodiment, an electronic device 200 for wirelesscommunication includes a processing circuitry 210. The processingcircuitry 210 includes a generating unit 211 and a control unit 213.

The generating unit 211 is configured to generate a DRS for anunlicensed band.

The control unit 213 is configured to control to transmit the DRS with ashorter subcarrier spacing than a subcarrier spacing corresponding to 15kHz.

According to another embodiment, an electronic device 200 for wirelesscommunication includes a processing circuitry 210. The processingcircuitry 210 includes a generating unit 211 and a control unit 213.

The generating unit 211 is configured to generate a DRS for anunlicensed band.

The control unit 213 is configured to, when DRSs to be transmittedcannot be completely transmitted within a currently configured DMTCwindow period, control to transmit the DRS using an extended DMTCwindow.

According to yet another embodiment, an electronic device 200 forwireless communication includes a processing circuitry 210. Theprocessing circuitry 210 includes a generating unit 211 and a controlunit 213.

The generating unit 211 is configured to generate a DRS for theunlicensed band.

The control unit 213 is configured to control to transmit the DRS by atarget channel in the unlicensed band without performing an energydetection for the target channel.

According to still another embodiment, an electronic device 200 forwireless communication includes a processing circuitry 210. Theprocessing circuitry 210 includes a generating unit 211 and a controlunit 213.

The generating unit 211 is configured to generate a DRS for theunlicensed band.

The control unit 213 is configured to control to transmit the DRS basedon a combination of an omnidirectional channel energy detection and adirectional channel energy detection.

The manner of the combination of an omnidirectional channel energydetection and a directional channel energy detection includes:performing the omnidirectional channel energy detection, anddirectionally transmitting the DRS if it is detected that a targetchannel is idle; if the omnidirectional channel energy detectionindicates that the target channel is non-idle, performing directionalchannel energy detection, directionally transmitting the DRS for adirection detected as being idle, and not transmitting the DRS for adirection detected as being non-idle.

Further, as shown in FIG. 8 , a wireless communication device 800according to an embodiment of the present disclosure includes agenerating device 810 configured to generate a DRS for an unlicensedband, the DRS contains a PSS, an SSS, and a CSI-RS.

Further, as shown in FIG. 9 , a wireless communication device 900according to an embodiment of the present disclosure includes agenerating device 910 and a control device 920. The generating device910 is configured to generate a DRS for the unlicensed band. The controldevice 920 may have a similar configuration to the control unit 213 inthe above various embodiments.

In addition, the wireless communication device according to anembodiment of the present disclosure may include a transceiver deviceand the electronic device according to the above embodiments. Theelectronic device may control the transceiver device to performtransmission and reception of DRS and/or related signals, and the like.

In addition, it should be noted that the electronic device and thewireless communication device according to embodiments of the presentdisclosure may be implemented not only on the base station side but alsoon the user equipment side.

The electronic device on the user side, for example, may be configuredto control to receive a DRS for an unlicensed band, where the DRScontains a PSS, an SSS, and a CSI-RS.

Further, for example, correspondingly to the above embodiments, theelectronic device on the user side may be configured to control toreceive information about a size of the extended DMTC window by alicensed frequency band.

Further, for example, correspondingly to the above embodiments, theelectronic device on the user side may be configured to control totransmit feedback information relating to reception status of the DRS tothe base station.

According to another embodiment, an electronic device for wirelesscommunication is provided that includes a processing circuitry. Theprocessing circuitry is configured to generate a discovery referencesignal DRS for an unlicensed band. The DRS contains a primarysynchronization signal PSS, a secondary synchronization signal SSS and aphysical broadcast channel demodulation reference signal PB CH-DMRS.

Optionally, the DRS may further contain a channel state informationreference signal CSI-RS.

FIG. 20 illustrates an example of a DRS configuration according to anembodiment of the present disclosure. As shown in FIG. 20 , a new DRSblock is composed of a PSS, an SSS, and a PBCH-DMRS. The function of NRPBCH-DMRS is to assist in decoding the PBCH, while the SSS and PBCH-DMRSare also used for measurement of SS/PBCH RSRP. The PSS, SSS andPBCH-DMRS can realize a full functionality of the traditional DRS.

Furthermore, whether or not to configure the CSI-RS may be determined,for example, by the base station according to a specific implementation.

It should be noted that although an example of arrangement order ofsymbols in a DRS block is given in FIG. 20 , the DRS structure accordingto an embodiment of the present disclosure is not limited to theillustrated example.

In the illustrated example, the number of symbols constituting a DRSblock is 4, although in other embodiments, the number of symbolsconstituting a DRS block may be more than 4.

As shown in the above example, according to an embodiment, the PSS, SSSand PBCH-DMRS constituting one DRS block may occupy successive OFDMsymbols. Preferably, the PSS, SSS and PBCH-DMRS in the same DRS blockmay be arranged in the same time slot to thereby further facilitatingdetection by a user. However, embodiments of the present disclosure arenot limited thereto. For example, the PSS, SSS and PBCH-DMRS in a DRSblock may also be inconsecutive (i.e., occupying inconsecutive OFDMsymbols in time domain), and may not be arranged in one time slot.

Further, the PSS, SSS and PBCH-DMRS in a DRS block may have variousarrangement orders. For example, the signal arrangement orders in a DRSblock may include:

-   -   PSS, SSS, PBCH-DMRS, PBCH-DMRS;    -   PSS, PBCH-DMRS, SSS, PBCH-DMRS;    -   PBCH-DMRS, PSS, SSS, PBCH-DMRS;    -   PSS, PBCH-DMRS, PBCH-DMRS, SSS;    -   PBCH-DMRS, PSS, PBCH-DMRS, SSS;    -   PBCH-DMRS, PBCH-DMRS, PSS, SSS;    -   SSS, PSS, PBCH-DMRS, PBCH-DMRS;    -   SSS, PBCH-DMRS, PSS, PBCH-DMRS;    -   PBCH-DMRS, SSS, PSS, PBCH-DMRS;    -   SSS, PBCH-DMRS, PBCH-DMRS, PSS;    -   PBCH-DMRS, SSS, PBCH-DMRS, PSS; or    -   PBCH-DMRS, PBCH-DMRS, SSS, PSS.

In the above description of an electronic device for wirelesscommunication according to an embodiment of the present disclosure,apparently, some methods and procedures are also disclosed. Next, adescription of a wireless communication method according to anembodiment of the present disclosure will be given without repeating thedetails that have been described above.

As shown in FIG. 3 , a wireless communication method according to anembodiment includes:

-   -   S310, generating a discovery reference signal DRS for an        unlicensed band, where the DRS contains a PSS, an SSS, and a        CSI-RS.

As shown in FIG. 4 , a wireless communication method according toanother embodiment includes:

-   -   S410, generating a DRS for an unlicensed band; and    -   S420, transmitting the DRS with a subcarrier spacing higher than        15 kHz.

As shown in FIG. 5 , a wireless communication method according to yetanother embodiment includes:

-   -   S510, generating a DRS for an unlicensed band; and    -   S520, when DRSs to be transmitted cannot be completely        transmitted within a currently configured DMTC window period,        transmitting the DRS using an extended DMTC window.

As shown in FIG. 6 , a wireless communication method according to stillanother embodiment includes:

-   -   S610, generating a DRS for an unlicensed band; and    -   S620, transmitting the DRS by a target channel in the unlicensed        band without performing an energy detection for the target        channel.

As shown in FIG. 7 , a wireless communication method according toanother embodiment includes:

-   -   S710, generating a DRS for an unlicensed band; and    -   S720, transmitting the DRS based on a combination of an        omnidirectional channel energy detection and a directional        channel energy detection.    -   a manner of the combination of an omnidirectional channel energy        detection and a directional channel energy detection includes:    -   performing the omnidirectional channel energy detection, and        directionally transmitting the DRS if it is detected that a        target channel is idle;    -   if the omnidirectional channel energy detection indicates that        the target channel is non-idle, performing the directional        channel energy detection, directionally transmitting the DRS for        a direction detected as being idle, and not transmitting the DRS        for a direction detected as being non-idle.

A wireless communication method according to another embodimentincludes: generating a discovery reference signal DRS for an unlicensedband. The DRS contains a primary synchronization signal PSS, a secondarysynchronization signal SSS and a physical broadcast channel demodulationreference signal PBCH-DMRS. Optionally, the DRS may further contain achannel state information reference signal CSI-RS.

In addition, the embodiments of the present disclosure further includesa computer readable medium which includes executable instructions that,when executed by an information processing device, cause the informationprocessing device to implement the method described above.

By way of example, various steps of the above methods as well as variousconstituent modules and/or units of the above device may be implementedas a software, a firmware, a hardware or a combination thereof. In thecase of being implemented by the software or the firmware, a programconstituting the software for implementing the above method may beinstalled from a storage medium or a network to a computer having adedicated hardware structure (for example, the general-purpose computer1000 shown in FIG. 10 ), This computer, when is installed variousprograms thereon, can perform various functions and the like.

In FIG. 10 , a central processing unit (i.e., CPU) 1001 executes variousprocesses in accordance with a program stored in a read only memory(ROM) 1002 or a program loaded from a storage section 1008 to a randomaccess memory (RAM) 1003. In the RAM 1003, data required when the CPU1001 executes various processes and the like is also stored as needed.The CPU 1001, the ROM 1002, and the RAM 1003 are linked to each othervia a bus 1004. An input/output interface 1005 is also linked to the bus1004.

The following components are linked to the input/output interface 1005:an input section 1006 (including a keyboard, a mouse, etc.), an outputsection 1007 (including a display such as a cathode ray tube (CRT), aliquid crystal display (LCD) and the like, and a speaker and the like),a storage section 1008 (including a hard disk or the like), acommunication section 1009 (including a network interface card such as aLAN card, a modem or the like). The communication section 1009 performscommunication processing via a network such as the Internet. A driver1010 can also be linked to the input/output interface 1005 as needed. Aremovable medium 1011 such as a magnetic disk, an optical disk, amagneto-optical disk, a semiconductor memory or the like is mounted onthe drive 1010 as needed, so that the computer program read therefrom isinstalled into the storage section 1008 as needed.

In the case where the above series of processing is implemented by asoftware, a program constituting the software is installed from anetwork such as the Internet or a storage medium such as the removablemedium 1011.

It will be understood by those skilled in the art that such a storagemedium is not limited to the removable medium 1011 shown in FIG. 10 inwhich a program is stored and which distributes separately from thedevice to provide the program to the user. Examples of the removablemedium 1011 include a magnetic disk (including a floppy disk (registeredtrademark)), an optical disk (including a compact disk read only memory(CD-ROM) and a digital versatile disk (DVD)), and a magneto-optical disk(including a mini-disk (MD) (registered trademark)) and a semiconductormemory. Alternatively, the storage medium may be the ROM 1002, a harddisk included in the storage section 1008 or the like, in which aprograms is stored, and distributed to the user together with the devicecontaining them.

Embodiments of the present disclosure also relate to a program productin which a machine readable instruction code is stored. When theinstruction code is read and executed by a machine, the above methodaccording to an embodiment of the present disclosure can be performed.

Accordingly, a storage medium for carrying the above program product inwhich the machine readable instruction code is stored is also includedin the disclosure of the present disclosure. The storage mediumincludes, but is not limited to, a floppy disk, an optical disk, amagneto-optical disk, a memory card, a memory stick, and the like.

Embodiments of the present application also relate to the followingelectronic device. In the case where the electronic device is used onthe base station side, the electronic device may be realized as any typeof gNB, evolved Node B (eNB), such as a macro eNB and a small eNB. Thesmall eNB may be an eNB such as a pico eNB, a micro eNB, and a home(femto) eNB that covers a cell smaller than a macro cell. Instead, theelectronic device may be realized as any other types of base stationssuch as a NodeB and a base transceiver station (BTS). The electronicdevice may include a main body (that is also referred to as a basestation device) configured to control wireless communication, and one ormore remote radio heads (RRH) disposed in a different place from themain body. In addition, various types of terminals, which will bedescribed below, may each operate as the base station by temporarily orsemi-persistently executing a base station function.

In the case where the electronic device is used on the user equipmentside, it may be realized as a mobile terminal (such as a smartphone, atablet personal computer (PC), a notebook PC, a portable game terminal,a portable/dongle type mobile router, and a digital camera), or anin-vehicle terminal (such as a car navigation apparatus). Furthermore,the electronic device may be a wireless communication module (such as anintegrated circuit module including a single or multiple die) mounted oneach of the terminals.

Application Examples Regarding a Terminal Device

FIG. 11 is a block diagram illustrating an example of a schematicconfiguration of a smartphone 2500 to which the technology of thepresent disclosure may be applied. The smartphone 2500 includes aprocessor 2501, a memory 2502, a storage 2503, an external connectioninterface 2504, a camera 2506, a sensor 2507, a microphone 2508, aninput apparatus 2509, a display apparatus 2510, a speaker 2511, a radiocommunication interface 2512, one or more antenna switches 2515, one ormore antennas 2516, a bus 2517, a battery 2518, and an auxiliarycontroller 2519.

The processor 2501 may be, for example, a CPU or a system on a chip(SoC), and controls functions of an application layer and another layerof the smartphone 2500. The memory 2502 includes RAM and ROM, and storesa program that is executed by the processor 2501, and data. The storage2503 may include a storage medium such as a semiconductor memory and ahard disk. The external connection interface 2504 is an interface forconnecting an external device (such as a memory card and a universalserial bus (USB) device) to the smartphone 900.

The camera 2506 includes an image sensor (such as a charge coupleddevice (CCD) and a complementary metal oxide semiconductor (CMOS)), andgenerates a captured image. The sensor 2507 may include a group ofsensors such as a measurement sensor, a gyro sensor, a geomagneticsensor, and an acceleration sensor. The microphone 2508 converts soundsthat are input to the smartphone 2500 to audio signals. The inputapparatus 2509 includes, for example, a touch sensor configured todetect a touch on a screen of the display apparatus 2510, a keypad, akeyboard, a button, or a switch, and receives an operation orinformation input from a user. The display apparatus 2510 includes ascreen (such as a liquid crystal display (LCD) and an organiclight-emitting diode (OLED) display), and displays an output image ofthe smartphone 2500. The speaker 2511 converts audio signals that areoutput from the smartphone 2500 to sounds.

The radio communication interface 2512 supports any cellularcommunication scheme (such as LTE and LTE-Advanced), and performswireless communication. The radio communication interface 2512 maytypically include, for example, a baseband (BB) processor 2513 and aradio frequency (RF) circuit 2514. The BB processor 2513 may perform,for example, encoding/decoding, modulating/demodulating, andmultiplexing/demultiplexing, and performs various types of signalprocessing for wireless communication. Meanwhile, the RF circuit 2514may include, for example, a mixer, a filter, and an amplifier, andtransmits and receives radio signals via the antenna 2516. The radiocommunication interface 2512 may be a one chip module having the BBprocessor 2513 and the RF circuit 2514 integrated thereon. The radiocommunication interface 2512 may include multiple BB processors 2513 andmultiple RF circuits 2514, as illustrated in FIG. 11 . Although FIG. 11illustrates the example in which the radio communication interface 2512includes multiple BB processors 2513 and multiple RF circuits 2514, theradio communication interface 2512 may also include a single BBprocessor 2513 or a single RF circuit 2514.

Furthermore, in addition to the cellular communication scheme, the radiocommunication interface 2512 may support another type of wirelesscommunication scheme such as a short-distance wireless communicationscheme, a near field communication scheme, and a radio local areanetwork (LAN) scheme. In that case, the radio communication interface2512 may include the BB processor 2513 and the RF circuit 2514 for eachwireless communication scheme.

Each of the antenna switches 2515 switches connection destinations ofthe antennas 2516 among multiple circuits (such as circuits fordifferent wireless communication schemes) included in the radiocommunication interface 2512.

Each of the antennas 2516 includes a single or multiple antenna elements(such as multiple antenna elements included in an MIMO antenna), and isused for the radio communication interface 2512 to transmit and receiveradio signals. The smartphone 2500 may include the multiple antennas2516, as shown in FIG. 11 . Although FIG. 11 illustrates the example inwhich the smartphone 2500 includes multiple antennas 2516, thesmartphone 2500 may also include a single antenna 2516.

Furthermore, the smartphone 2500 may include the antenna 2516 for eachwireless communication scheme. In that case, the antenna switches 2515may be omitted from the configuration of the smartphone 2500.

The bus 2517 connects the processor 2501, the memory 2502, the storage2503, the external connection interface 2504, the camera 2506, thesensor 2507, the microphone 2508, the input apparatus 2509, the displayapparatus 2510, the speaker 2511, the radio communication interface2512, and the auxiliary controller 2519 to each other. The battery 2518supplies power to each block of the smartphone 2500 shown in FIG. 11 viafeeder lines, which are partially shown as dashed lines in the figure.The auxiliary controller 2519 operates a minimum necessary function ofthe smartphone 2500, for example, in a sleep mode.

In the smartphone 2500 shown in FIG. 11 , a transceiver device of thewireless communication device on the user equipment side according to anembodiment of the present disclosure may be implemented by the radiocommunication interface 2512. At least a part of functionality of theprocessing circuit and/or the respective units of the electronic deviceor the wireless communication device on the user equipment sideaccording to an embodiment of the present disclosure may also beimplemented by the processor 2501 or the auxiliary controller 2519. Forexample, the power consumption of the battery 2518 may be reduced byperforming a part of functionality of the processor 2501 by theauxiliary controller 2519. Further, the processor 2501 or the auxiliarycontroller 2519 may execute at least a part of functionality of theprocessing circuit and/or the respective units of the electronic deviceor the wireless communication device on the user equipment side on theuser equipment side according to the embodiment of the presentdisclosure by executing the program stored in the memory 2502 or thestorage device 2503.

Application Examples Regarding a Base Station

FIG. 12 is a block diagram illustrating an example of a schematicconfiguration of a gNB to which the technology of the present disclosuremay be applied. A gNB 2300 includes one or more antennas 2310 and a basestation device 2320. Each antenna 2310 and the base station device 2320may be connected to each other via an radio frequency (RF) cable.

Each of the antennas 2310 includes a single or multiple antenna elements(such as multiple antenna elements included in a multiple input mitipleoutput (MIMO) antenna), and is used for the base station device 2320 totransmit and receive radio signals. The gNB 2300 may include multipleantennas 2310, as illustrated in FIG. 12 . For example, the multipleantennas 2310 may be compatible with multiple frequency bands used bythe gNB 2300. Although FIG. 12 illustrates an example in which the gNB2300 includes the multiple antennas 2310, the gNB 2300 may also includea single antenna 2310.

The base station device 2320 includes a controller 2321, a memory 2322,a network interface 2323, and a radio communication interface 2325.

The controller 2321 may be, for example, a CPU or a DSP, and operatesvarious functions of a higher layer of the base station device 2320. Forexample, the controller 2321 generates a data packet from data insignals processed by the radio communication interface 2325, andtransfers the generated packet via the network interface 2323. Thecontroller 2321 may bundle data from multiple base band processors togenerate the bundled packet, and transfer the generated bundled packet.The controller 2321 may have logical functions of performing controlsuch as wireless resource control, wireless bearer control, mobilitymanagement, admission control, and a scheduling. The control may beperformed in corporation with a gNB or a core network node in thevicinity. The memory 2322 includes RAM and ROM, and stores a programthat is executed by the controller 2321, and various types of controldata (such as a terminal list, transmission power data, and schedulingdata).

The network interface 2323 is a communication interface for connectingthe base station device 2320 to a core network 2324. The controller 2321may communicate with a core network node or another gNB via the networkinterface 2323. In that case, the gNB 2300, and the core network node orthe other gNB may be connected to each other through a logical interface(such as an S1 interface and an X2 interface). The network interface2323 may also be a wired communication interface or a radiocommunication interface for wireless backhaul. If the network interface2323 is a radio communication interface, the network interface 2323 mayuse a higher frequency band for wireless communication than a frequencyband used by the radio communication interface 2325.

The radio communication interface 2325 supports any cellularcommunication scheme (such as Long Term Evolution (LTE) andLTE-Advanced), and provides wireless connection to a terminal positionedin a cell of the gNB 2300 via the antenna 2310. The radio communicationinterface 2325 may typically include, for example, a BB processor 2326and an RF circuit 2327. The BB processor 2326 may perform, for example,encoding/decoding, modulating/demodulating, andmultiplexing/demultiplexing, and performs various types of signalprocessing of layers (such as L1, medium access control (MAC), radiolink control (RLC), and a packet data convergence protocol (PDCP)). TheBB processor 2326 may have a part or all of the above-described logicalfunctions instead of the controller 2321. The BB processor 2326 may be amemory that stores a communication control program, or a module thatincludes a processor and a related circuit configured to execute theprogram. Updating the program may allow the functionality of the BBprocessor 2326 to be changed. The module may be a card or a blade thatis inserted into a slot of the base station device 2320. Alternatively,the module may also be a chip that is mounted on the card or the blade.Meanwhile, the RF circuit 2327 may include, for example, a mixer, afilter, and an amplifier, and transmits and receives wireless signalsvia the antenna 2310.

The radio communication interface 2325 may include multiple BBprocessors 2326, as illustrated in FIG. 12 . For example, the multipleBB processors 2326 may be compatible with multiple frequency bands usedby the gNB 2300. The radio communication interface 2325 may includemultiple RF circuits 2327, as illustrated in FIG. 12 . For example, themultiple RF circuits 2327 may be compatible with multiple antennaelements. Although FIG. 12 illustrates the example in which the radiocommunication interface 2325 includes the multiple BB processors 2326and the multiple RF circuits 2327, the radio communication interface2325 may also include a single BB processor 2326 or a single RF circuit2327.

In gNB 2300 shown in FIG. 12 , the transceiver device of the wirelesscommunication device on the base station side according to an embodimentof the present disclosure may be implemented by the radio communicationinterface 2325. At least a part of functionality of the processingcircuit and/or the respective units of the electronic device or thewireless communication device on the base station side according to anembodiment of the present disclosure may also be implemented by thecontroller 2321. For example, the controller 2321 may execute at least apart of functionality of the processing circuit and/or the respectiveunits of the electronic device or the wireless communication device onthe base station side according to the embodiment of the presentdisclosure by executing the program stored in the memory 2322.

In the above description of specific embodiments of the presentdisclosure, features described and/or illustrated with respect to oneembodiment may be used, in the same or similar manner, in one or moreother embodiments, combined with features in the other embodiments, orreplace features in other embodiments.

It should be emphasized that the term “comprising” or “including” isused herein to mean the presence of a feature, an element, a step, or acomponent, but does not exclude the presence or addition of one or moreother features, elements, steps or components.

In the above embodiments and examples, reference numerals made up ofnumbers have been used to indicate various steps and/or units. Thoseskilled in the art will understand that these reference numerals areonly for convenience of description and drawing, and are not intended torepresent its order or any other limitation.

Further, the method according to the present disclosure is not limitedto being performed in the time order described in the specification, andmay also be performed in other time orders, in parallel, orindependently. Therefore, the order of execution of the methodsdescribed in the present specification does not limit the technicalscope of the present disclosure.

While the preset disclosure has been disclosed above by a description ofspecific embodiments of the present disclosure, it should be understoodthat, all of the above embodiments and examples are illustrative, butnot limiting. Various modifications, improvements or equivalents of thepresent disclosure may be devised by those skilled in the art within thespirit and scope of the appended claims. Such modifications,improvements, or equivalents should also be considered to be includedwithin the scope of protection of the present disclosure.

1. An electronic device for wireless communication, comprising:processing circuitry configured to generate a discovery signal for ashared band; wherein the discovery signal contains at least one of aprimary synchronization signal (PSS), a secondary synchronization signal(SSS) or a channel state information reference signal (CSI-RS), andtransmit the discovery signal in different beam directions, wherein thediscovery signal indicates information relating to a transmission beamindex related to the different beam directions.
 2. The electronic deviceaccording to claim 1, wherein the SSS follows the PSS in the discoverysignal.
 3. The electronic device according to claim 1, wherein the PSSand the SSS share the same frequency resources.
 4. The electronic deviceaccording to claim 1, wherein the PSS and the SSS occupy inconsecutiveOFDM symbols in time domain.
 5. The electronic device according to claim1, wherein the PSS and the SSS only occupy a predetermined number ofcentral subcarriers.
 6. The electronic device according to claim 1,wherein the discovery signal is transmitted during a window period. 7.The electronic device according to claim 6, wherein, when discoverysignal cannot be completely transmitted within the window period,transmit the discovery signal using an extended window period.
 8. Theelectronic device according to claim 1, wherein the PSS, the SSS and/orthe CSI-RS constituting one DRS block occupy successive orthogonalfrequency division multiplexing (OFDM) symbols.
 9. The electronic deviceaccording to claim 1, wherein the PSS, the SSS and/or the CSI-RS in thesame DRS block are within the same time slot.
 10. The electronic deviceaccording to claim 1, wherein one discovery signal block has a length ofat least four orthogonal frequency division multiplexing (OFDM) symbols.11. The electronic device according to claim 1, wherein the processingcircuitry is further configured to: transmit the discovery signal with asubcarrier spacing shorter than a subcarrier spacing corresponding to 15kHz, or transmit the discovery signal with a subcarrier spacingcorresponding to 120 kHz, 240 kHz or 480 kHz.
 12. The electronic deviceaccording to claim 1, wherein the processing circuitry is furtherconfigured to control to transmit the discovery signal based on one of:an omnidirectional channel energy detection; a directional channelenergy detection; or a combination of an omnidirectional channel energydetection and a directional channel energy detection.
 13. The electronicdevice according to claim 12, wherein the combination of theomnidirectional channel energy detection and the directional channelenergy detection comprises: performing the omnidirectional channelenergy detection, and directionally transmitting the discovery signal ifit is detected that a target channel is idle; or if the omnidirectionalchannel energy detection indicates that the target channel is non-idle,performing the directional channel energy detection, directionallytransmitting the discovery signal for a direction detected as beingidle, and not transmitting the discovery signal for a direction detectedas being non-idle.
 14. The electronic device according to claim 1,wherein the processing circuitry is further configured to control totransmit the discovery signal with a discovery measurement timingconfiguration (DMTC) period less than 40 ms.
 15. A wirelesscommunication method by a communication device having a processor, themethod comprising: generating a discovery signal for a shared band,wherein the discovery signal contains at least one of a primarysynchronization signal (PSS), a secondary synchronization signal (SSS)or a channel state information reference signal (CSI-RS); andtransmitting the discovery signal in different beam directions, andwherein the discovery signal indicates information relating to atransmission beam index related to the different beam directions. 16.The method according to claim 15, wherein the discovery signal istransmitted during a window period.
 17. The method according to claim16, further comprising: when the transmitting the discovery signalcannot be completed within the window period, transmitting the discoverysignal using an extended window period.
 18. An electronic device forwireless communication, comprising: processing circuitry configured tosearch for a discovery signal for a shared band; and receive thediscovery signal, wherein the discovery signal contains at least one ofa primary synchronization signal (PSS), a secondary synchronizationsignal (SSS) or a channel state information reference signal (CSI-RS),wherein the discovery signal is transmitted in different beamdirections, and wherein the discovery signal indicates informationrelating to a transmission beam index related to the different beamdirections.